Mark the letter A, B, C, or D on you...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
The traffic is so heavy. It will take us at least an hour to get there.

A. Unless the traffic is heavy, it will take us at least an hour to get there.

B. As the traffic is so heavy, it will take us at least an hour to get there.

C. The traffic was so heavy that it took us an hour to get there.

D. We will spend more than an hour to get there to avoid heavy traffic.